pystego

Drew Monroe

Description

This is a fun project that I will probably use as a demonstration for a project for class. The idea is to use the least two significant bits of the channel image to hide a secret, which can be arbitrary data. Each byte of the secret data is broken up into chunks of 2 bits each. Then, we take one pixel of the channel image, and replace the lower two bits of that pixel with the first chunk of the secret. We then take the next pixel, and replace the lower two bits with the next chunk of the secret. The process continues until there are no more chunks, at which point the channel image is used to fill in the rest of the image. This is NOT meant to be used for actual steganographic purposes, it's just a fun demo.

Installation

pip install git+https://github.com/DrewMonroe/steganography.git#egg=pystego

Usage

# To encode an image
encode_image --secret tux.png --channel crab_nebula.png --out hidden.png
# To decode an image
decode_image --encoded hidden.png --out recovered.png

Limitations

• The image that you are hiding your data inside of must be a PNG with alpha values
• Only the lower two bits of the channel image are used to hide the secret. There is currently no way to configure this.